Date.prototype._format = function (fmt) { //author: meizz
	var o = {
		"M+": this.getMonth() + 1, //月份
		"d+": this.getDate(), //日
		"h+": this.getHours(), //小时
		"m+": this.getMinutes(), //分
		"s+": this.getSeconds(), //秒
		"q+": Math.floor((this.getMonth() + 3) / 3), //季度
		"S": this.getMilliseconds() //毫秒
	};

	if (/(y+)/.test(fmt)) {
		fmt = fmt.replace(RegExp.$1, (this.getFullYear() + "").substr(4 - RegExp.$1.length));
	}
		
	for (var k in o) 
		if (new RegExp("(" + k + ")").test(fmt)) 
			fmt = fmt.replace(RegExp.$1, (RegExp.$1.length == 1)
				? (o[k])
				: (("00" + o[k]).substr(("" + o[k]).length)));
	return fmt;
}